An ancient board game, played for around 4,000 years now. Very popular in Asia, and slowly growing in popularity in the West. I am about a 2-dan in strength, although I generally don't have a ton of time to play anymore. If you are interested, I have some of my old teaching games available for online viewing.
Developing for mobile devices is always fun; there's just no beating the convenience of being able to take a powerful computing device with you everywhere. I got started in this area by doing some work on the Rockbox open source mp3-player firmware, and the technology has improved by leaps and bounds since. Currently I'm mostly working on Android applications, which you can find on my Android page.
Security research first interested me for professional reasons, but its reach certainly streches outside of the world of computer science. I highly recommend Bruce Schneier's works on the subject. Much of his work is even quite accessible to laymen, including Crypto-gram, his monthly e-mail newsletter.
Turns out that there are a ton of great places to hike in and around Phoenix, although it's a bit tough in the summer. My wonderful girlfriend and I have been taking our dogs with us all over the place and having a great time. I usually post pictures of our hikes on Google+, let me know if you'd like to take a look.
I've had a love of books from a very young age. The first books that I remember really getting into were a collection of classic Sci-Fi from the 1950s and 1960s, known as the Winston Science Fiction set.
I primarily read Sci-Fi and Fantasy, preferably epic stories with wide-ranging worlds. Currently I'm reading the Malazan Book of the Fallen series.
Algorithms were one of the main reasons that I originally got interested in computer science, and they still facinate me. They're one of the purest applications of mathematics to the real world, and can really improve our lives in surprising ways. Thankfully, there's many lifetimes worth of study to do on algorithmic analysis and design, so I shouldn't run out anytime soon.